A $100,000-plus ad buy is planned for Monday for the South Florida, Orlando and Jacksonville media markets, campaign spokeswoman Claire VanSusteren said. Greene is trying to emerge at the top of a crowded Democratic field. He’s poured more than $20 million into television advertising.

Also in the contest are Tallahassee Mayor Andrew Gillum, former U.S. Rep. Gwen Graham, Winter Park businessman Chris King and former Miami Beach Mayor Philip Levine.

More than 1.5 million voters have already cast ballots for the Aug. 28 primary elections, either in-person or by mail, including 705,825 by Republicans and 634,361 by Democrats.